Which of the following is not a durable good?

The Central Bank of Wiknam decreases the money supply at the same time the Parliament of Wiknam repeals a new investment tax credit. Which of these policies shifts aggregate-demand curve to the left?

a) the investment tax credit repeal but not the money supply decrease b) the money supply decrease but not the investment tax credit repeal c) both the money supply decrease and the investment tax credit repeal d) neither the investment tax credit repeal nor the money supply decrease

Which of the following leads to the demanders paying all of a tax?

A) The supply is unit elastic. B) The supply is perfectly inelastic. C) The demand is perfectly elastic. D) The demand is perfectly inelastic.